Swan , Michael  <br/><br/>
Practical english usage :  

 - Oxford :   America ;  1980. 
 - 654 p; 21cm .  01 
 - 2024-09-25 
<br/><br/><label>ISBN: </label>0194421465 
<br/><br/><label>Nat. Bib. No.: </label>0010636 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>SWA 
<br/><br/><label>Universal Decimal Class. No.: </label>420